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Groups > comp.lang.forth > #13034
| From | anton@mips.complang.tuwien.ac.at (Anton Ertl) |
|---|---|
| Newsgroups | comp.lang.forth |
| Subject | Re: ?EXEC |
| Date | 2012-06-17 12:52 +0000 |
| Organization | Institut fuer Computersprachen, Technische Universitaet Wien |
| Message-ID | <2012Jun17.145259@mips.complang.tuwien.ac.at> (permalink) |
| References | <m5oer1.l31@spenarnc.xs4all.nl> |
Albert van der Horst <albert@spenarnc.xs4all.nl> writes:
>I find places where ?EXEC is used. This gives an error because a word
>if a word is executed while it never should.
>
>Examples are CODE and END-CODE in an assembler, but does this make
>sense?
>
>: CODE ?EXEC .... ;
>: END-CODE ?EXEC .... ;
Hardly. It makes a little more sense if CODE and END-CODE are
immediate. I guess the idea is to protect the porgrammer against
: foo
... \ missing ";"
code bar
...
And of course in fig-Forth also ":" was immediate and contained a
?EXEC.
For defining words we usually get an error when the name of the word
to be defined is seen; ok, the error is not as descriptive as the one
produced by ?EXEC, but programmers learn to interpret it pretty fast.
And the disadvantages are pretty bad: First, if you want to include
CODE (or ":") in another word, you have to use [COMPILE] or POSTPONE
(note that standard CODE and : don't need this). Worse, that word
becomes STATE-smart; if you tick it and then happen to EXECUTE the xt
in compile STATE, you get an error, pretty removed from the cause of
the whole thing.
Overall, ?EXEC is a bad idea, like ?COMP and STATE-smart words in
general.
- anton
--
M. Anton Ertl http://www.complang.tuwien.ac.at/anton/home.html
comp.lang.forth FAQs: http://www.complang.tuwien.ac.at/forth/faq/toc.html
New standard: http://www.forth200x.org/forth200x.html
EuroForth 2012: http://www.euroforth.org/ef12/
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?EXEC Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-06-15 20:40 +0000
Re: ?EXEC "Ed" <invalid@nospam.com> - 2012-06-16 11:14 +1000
Re: ?EXEC BruceMcF <agila61@netscape.net> - 2012-06-16 07:10 -0700
Re: ?EXEC Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-06-17 03:01 +0000
Re: ?EXEC "Ed" <invalid@nospam.com> - 2012-06-17 13:36 +1000
Re: ?EXEC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-06-17 12:27 +0000
Re: ?EXEC Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-06-17 20:45 +0000
Re: ?EXEC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-06-18 13:31 +0000
Re: ?EXEC Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-06-18 18:29 +0000
Re: ?EXEC "Elizabeth D. Rather" <erather@forth.com> - 2012-06-18 08:01 -1000
Re: ?EXEC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-06-19 14:09 +0000
Re: ?EXEC Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-06-19 10:51 -0500
Re: ?EXEC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-06-19 16:04 +0000
Re: ?EXEC Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-06-19 12:45 -0500
Re: ?EXEC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-06-20 10:50 +0000
Re: ?EXEC Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-06-20 07:10 -0500
Re: ?EXEC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-06-20 12:47 +0000
Re: ?EXEC Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-06-19 22:52 +0000
Re: ?EXEC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-06-20 10:59 +0000
Defining Compilation Behaviour - was Re: ?EXEC JennyB <jennybrien@googlemail.com> - 2012-06-21 04:58 -0700
Re: Defining Compilation Behaviour - was Re: ?EXEC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-06-21 15:44 +0000
Re: ?EXEC Bernd Paysan <bernd.paysan@gmx.de> - 2012-06-19 02:11 +0200
Re: ?EXEC "Elizabeth D. Rather" <erather@forth.com> - 2012-06-18 14:45 -1000
Re: ?EXEC Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-06-19 10:48 +0000
Re: ?EXEC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-06-19 15:53 +0000
Re: ?EXEC Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-06-19 23:00 +0000
Re: ?EXEC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-06-20 11:09 +0000
Re: ?EXEC BruceMcF <agila61@netscape.net> - 2012-06-20 07:39 -0700
Re: ?EXEC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-06-20 15:32 +0000
Re: ?EXEC BruceMcF <agila61@netscape.net> - 2012-06-21 11:24 -0700
Re: ?EXEC Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-06-20 22:43 +0000
Re: ?EXEC Bernd Paysan <bernd.paysan@gmx.de> - 2012-06-21 21:39 +0200
Re: ?EXEC Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-06-22 02:33 -0500
Re: ?EXEC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-06-22 11:12 +0000
Re: ?EXEC Bernd Paysan <bernd.paysan@gmx.de> - 2012-06-22 21:34 +0200
Re: ?EXEC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-06-24 14:58 +0000
Re: ?EXEC Bernd Paysan <bernd.paysan@gmx.de> - 2012-06-24 23:53 +0200
Re: ?EXEC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-06-19 15:43 +0000
Re: ?EXEC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-06-19 14:52 +0000
Re: ?EXEC Bernd Paysan <bernd.paysan@gmx.de> - 2012-06-21 22:15 +0200
Re: ?EXEC stephenXXX@mpeforth.com (Stephen Pelc) - 2012-06-22 10:32 +0000
Re: ?EXEC Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-06-22 05:49 -0500
Alternatives to S" and TO (was: ?EXEC) anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-06-22 15:19 +0000
Re: Alternatives to S'' and TO mhx@iae.nl (Marcel Hendrix) - 2012-06-22 20:37 +0200
Re: Alternatives to S'' and TO anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-06-23 14:46 +0000
Re: Alternatives to S" and TO (was: ?EXEC) BruceMcF <agila61@netscape.net> - 2012-06-22 12:32 -0700
Re: Alternatives to S" and TO Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-06-23 03:07 -0500
Re: Alternatives to S" and TO anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-06-23 13:32 +0000
Re: Alternatives to S" and TO Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-06-24 08:50 -0500
Re: Alternatives to S" and TO anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-06-24 15:39 +0000
Re: Alternatives to S" and TO Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-06-25 04:49 -0500
Re: Alternatives to S" and TO BruceMcF <agila61@netscape.net> - 2012-06-25 07:17 -0700
Re: Alternatives to S" and TO Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-06-25 10:13 -0500
Re: Alternatives to S" and TO (was: ?EXEC) Alex McDonald <blog@rivadpm.com> - 2012-06-23 16:01 -0700
Re: Alternatives to S" and TO (was: ?EXEC) Bernd Paysan <bernd.paysan@gmx.de> - 2012-06-24 01:59 +0200
Re: Alternatives to S" and TO (was: ?EXEC) anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-06-24 13:21 +0000
Re: Alternatives to S" and TO (was: ?EXEC) Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-06-24 16:50 +0000
Re: Alternatives to S" and TO (was: ?EXEC) Bernd Paysan <bernd.paysan@gmx.de> - 2012-06-27 23:30 +0200
Re: Alternatives to S" and TO (was: ?EXEC) anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-06-24 13:15 +0000
Re: Alternatives to S" and TO (was: ?EXEC) Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-06-24 16:47 +0000
Re: ?EXEC Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-06-22 20:34 +0000
Re: ?EXEC Bernd Paysan <bernd.paysan@gmx.de> - 2012-06-22 21:46 +0200
Re: ?EXEC "Elizabeth D. Rather" <erather@forth.com> - 2012-06-22 10:16 -1000
Re: ?EXEC Bernd Paysan <bernd.paysan@gmx.de> - 2012-06-22 22:43 +0200
Re: ?EXEC "Elizabeth D. Rather" <erather@forth.com> - 2012-06-22 11:18 -1000
Re: ?EXEC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-06-23 13:50 +0000
Re: ?EXEC BruceMcF <agila61@netscape.net> - 2012-06-17 10:41 -0700
Re: ?EXEC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-06-17 12:52 +0000
Re: ?EXEC "Elizabeth D. Rather" <erather@forth.com> - 2012-06-17 08:03 -1000
Re: ?EXEC "Ed" <invalid@nospam.com> - 2012-06-18 15:06 +1000
Re: ?EXEC "Elizabeth D. Rather" <erather@forth.com> - 2012-06-17 20:31 -1000
Re: ?EXEC "Ed" <invalid@nospam.com> - 2012-06-21 13:07 +1000
Re: ?EXEC Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-06-21 14:00 +0000
Re: ?EXEC BruceMcF <agila61@netscape.net> - 2012-06-21 07:51 -0700
Re: ?EXEC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-06-21 15:39 +0000
Re: ?EXEC Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-06-21 20:28 +0000
Re: ?EXEC "Ed" <invalid@nospam.com> - 2012-06-28 14:22 +1000
Re: ?EXEC Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-06-28 04:00 -0500
Re: ?EXEC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-06-21 16:09 +0000
Re: ?EXEC Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-06-21 11:51 -0500
Re: ?EXEC BruceMcF <agila61@netscape.net> - 2012-06-21 11:21 -0700
Re: ?EXEC Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-06-22 01:42 -0500
Re: ?EXEC "Elizabeth D. Rather" <erather@forth.com> - 2012-06-21 21:47 -1000
Re: ?EXEC anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-06-22 15:10 +0000
Re: ?EXEC Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-06-22 20:39 +0000
Re: ?EXEC BruceMcF <agila61@netscape.net> - 2012-06-22 12:47 -0700
Re: ?EXEC BruceMcF <agila61@netscape.net> - 2012-06-22 12:53 -0700
Re: ?EXEC stephenXXX@mpeforth.com (Stephen Pelc) - 2012-06-21 08:39 +0000
Re: ?EXEC "Ed" <invalid@nospam.com> - 2012-06-23 15:36 +1000
Re: ?EXEC stephenXXX@mpeforth.com (Stephen Pelc) - 2012-06-23 10:58 +0000
Re: ?EXEC "Ed" <invalid@nospam.com> - 2012-06-25 14:26 +1000
Re: ?EXEC stephenXXX@mpeforth.com (Stephen Pelc) - 2012-06-25 08:37 +0000
Re: ?EXEC Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-06-18 10:34 +0000
Re: ?EXEC Coos Haak <chforth@hccnet.nl> - 2012-06-18 17:47 +0200
Re: ?EXEC Coos Haak <chforth@hccnet.nl> - 2012-06-18 17:49 +0200
Re: ?EXEC jacko <jackokring@gmail.com> - 2012-06-22 15:43 -0700
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